Gums I enjoy your posts and as FlightDetent says this is probably not the place for flight control discussions except for MACS but....
1. A320 has spring feel for artificial feel as in F86 without the bob weight.
2. Longitudinal control is manoeuvre demand, eg stick force per G or per pitch rate, or a blend of the two depending on speed/alpha.
3. Beyond the autotrim envelope a pull force is required for lower speeds, a push force is required for higher speeds.
4. In Direct Law - stick to surface, the aircraft is conventionally stable and requires manual trim operation to trim out forces when the speed is changed. Stick force per G is conventional.
5. My first aircraft with an electronically signalled flight control mode was the Mirage111 in Autocommand, circa 1969 plenty of Mirage pilots earlier.
6. My first FBW airliner was Airbuse's A300 FBW F-BAUD March 1986.
7. There were literally years of negotiations/ discussions on what FBW characteristics would be considered as acceptable as "Equivalent Safety" to the then current stability and control standards standards US FAA/ UK CAA/ French DGAC.
Links may help - the sidestick link is from a serious flight simmer with an OEM sidestick which he stripped for repairs.
https://sim-on-a320.com/blog/2016/08...al-sidesticks/
https://davi.ws/avionics/TheAvionicsHandbook_Cap_12.pdf
Thank you for your interesting posts - and your service.
Cheers mate.
Oh
https://sim-on-a320.com/blog/2017/03...prings-repair/